Round-bottom chair base



FIG. 1 is a perspective view of the round-bottom chair base showing my new design;

FIG. 2 is a perspective view thereof from another angle;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a right side elevational view thereof;

FIG. 7 is a top plan view thereof;

FIG. 8 is a bottom plan view thereof; and,

FIG. 9 is a partial enlarged view of portion 9 in FIG. 2 . 

CLAIM The ornamental design for a round-bottom chair base, as shown and described. 